<template>
  <div class="type-nav">
    <div class="container" @mouseleave="leaveIndex">
      <div @mouseleave="leaveShow" @mouseenter="enterShow" class="">
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
        <div class="sort" v-show="show">
            <div class="all-sort-list2" @click="goSearch">
                <div class="item bo" v-for="(c1,index) in categoryList" :key="c1.categoryId">
                    <h3 @mouseenter="changeIndex(index)" :class="{cur:currentIndex==index}">
                        <a :data-categoryName="c1.categoryName"  :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
                    </h3>
                    <div class="item-list clearfix" :style="{ display: currentIndex == index ? 'block' : 'none' }">
                        <div class="subitem" v-for="(c2,index) in c1.categoryChild" :key="c2.categoryId">
                            <dl class="fore">
                                <dt>
                                    <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                                </dt>
                                <dd>
                                    <em v-for="(c3,index) in c2.categoryChild" :key="c3.categoryId">
                                        <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a>
                                    </em>
                                </dd>
                            </dl>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        </transition>
      </div>
      <nav class="nav">
            <a href="###">服装城</a>
            <a href="###">美妆馆</a>
            <a href="###">尚品汇超市</a>
            <a href="###">全球购</a>
            <a href="###">闪购</a>
            <a href="###">团购</a>
            <a href="###">有趣</a>
            <a href="###">秒杀</a>
        </nav>
    </div>
  </div>
</template>
<script>

import { mapState } from "vuex";
import  throttle  from "lodash/throttle";

export default {
  name:'TypeNav',
   data() {
      return {
        currentIndex:-1,
        show: true,
      }
   },
   mounted(){
  
    if (this.$route.path != "/home") {
      this.show = false;
    }
   },
   computed:{
    ...mapState({
      categoryList:state=>state.home.categoryList
    })
   },
   methods:{
    changeIndex:throttle(function(index){
      this.currentIndex=index
    },50),
    leaveIndex(){
      this.currentIndex=-1
    },
    goSearch(event){
      let element =event.target
      let{categoryname,category1id,category2id,category3id}=element.dataset

      if(categoryname){
        let location={name:'search'}
        let query={categoryName:categoryname}
        if(category1id){
          query.category1Id=category1id
        }else if(category2id){
          query.category2Id=category2id
        }else{
          query.category3Id = category3id;
        }
          location.params = this.$route.params;
          location.query=query
          this.$router.push(location)     
      }
    },
    enterShow() {
      if (this.$route.path != "/home") {
        this.show = true;
      }
    },
    //当鼠标离开的时候，让商品分类列表进行隐藏
    leaveShow() {
      this.currentIndex = -1;
      //判断如果是Search路由组件的时候才会执行
      if (this.$route.path != "/home") {
        this.show = false;
      }
    },
   },
}
</script>
<style lang="less" scoped>
.type-nav {
        border-bottom: 2px solid #e1251b;

        .container {
            width: 1200px;
            margin: 0 auto;
            display: flex;
            position: relative;

            .all {
                width: 210px;
                height: 45px;
                background-color: #e1251b;
                line-height: 45px;
                text-align: center;
                color: #fff;
                font-size: 14px;
                font-weight: bold;
            }

            .nav {
                a {
                    height: 45px;
                    margin: 0 22px;
                    line-height: 45px;
                    font-size: 16px;
                    color: #333;
                }
            }

            .sort {
                position: absolute;
                left: 0;
                top: 45px;
                width: 210px;
                height: 461px;
                position: absolute;
                background: #fafafa;
                z-index: 999;

                .all-sort-list2 {
                    .item {
                        h3 {
                            line-height: 27px;
                            font-size: 14px;
                            font-weight: 400;
                            overflow: hidden;
                            padding: 0 20px;
                            margin: 0;

                            a {
                                color: #333;
                            }
                        }

                        .item-list {
                            display: none;
                            position: absolute;
                            width: 734px;
                            min-height: 460px;
                            background: #f7f7f7;
                            left: 210px;
                            border: 1px solid #ddd;
                            top: 0;
                            z-index: 9999 !important;

                            .subitem {
                                float: left;
                                width: 650px;
                                padding: 0 4px 0 8px;

                                dl {
                                    border-top: 1px solid #eee;
                                    padding: 6px 0;
                                    overflow: hidden;
                                    zoom: 1;

                                    &.fore {
                                        border-top: 0;
                                    }

                                    dt {
                                        float: left;
                                        width: 54px;
                                        line-height: 22px;
                                        text-align: right;
                                        padding: 3px 6px 0 0;
                                        font-weight: 700;
                                    }

                                    dd {
                                        float: left;
                                        width: 415px;
                                        padding: 3px 0 0;
                                        overflow: hidden;

                                        em {
                                            float: left;
                                            height: 14px;
                                            line-height: 14px;
                                            padding: 0 8px;
                                            margin-top: 5px;
                                            border-left: 1px solid #ccc;
                                        }
                                    }
                                }
                            }
                        }
                    }
                    .cur{
                      background-color: skyblue;
                    }
                }
            }
          .sort-enter {
            height: 0px;
          }
          // 过渡动画结束状态（进入）
          .sort-enter-to {
            height: 461px;
          }
          // 定义动画时间、速率
          .sort-enter-active {
            transition: all 0.5s linear;
          }
        }
    }
</style>
